Regarding the use of cut-down .38 Auto or .38 Super brass in 9x19mm pistols: I am not sure how wise this is. First, the 9x19mm is a true rimless case, but the .38 is semi-rimmed. I suppose one could turn down the rim on the .38, but this seems like a lot of work considering the availability (universally!) of 9x19mm ammo and brass.
Also, 9x19mm is a tapered case, and IIRC, the .38s are straight walled. I suppose one could size the cut-down .38s in a 9x19mm size die, but again, why?
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